Assig-itobs to- tsis clyde s



D. A. CLARK AND 0 E. LOWE. IVIANDREL FOR PNEUMATIC TIRE TUBES, APPLICATION FILED MAR. 7, I919.

11,3 1 6,275 Patented Sept; 16, 1919.

t? it? t? .12.. Ll 4L at. airline EON A. CLARK. AND CLYDE E. LDWE, OE CLEVELAND, Oil-KID. ASSIGZQ'ORS TU'IEIE CLYDE E. LGWE CGZILEIANY, 0F CLEVELAN. OHIO, A CORPORATION 01-110.

MANDEEL FER ENEUhZATIG-TIEE TUBES.

Specification or Letters Patent.

Application file iiarch '7, 1919. Serial No. 283.3%.

To aZZ whom it may cancer-a:

Be it known that we, Dor A. Oman and CLYDE Lows, citizens of the United States, residing Cleveland, in the county of Cuyahcga and State of Ohio. have insheet metal and is made of substantially torus form but with its ends spaced apart so that the rubber tube can be removed therefrom after curing. Our improved bridge comprises a removable section adapted to connect these ends and form a support for the whole during the curing. I

In the drawings accompanying and forming a part of this application we have shown certain mechanical constructions in which our inventive idea can be embodied, although it will be understood that saiddrawings are illustrative only and do not limit us to the particular features therein shown. in the drawings Figure l is a detail view partly in section of a portion of a mandrel embodying our invention together with a tube thereon and part of the winding used during the curing; hi represents a side elevation of our improved bridging member; Fig. 3 is a sectional view of the bridgingmember closed; and Fig. of the same member open; Fig. 5 is a plan view of a complete mandrel showing our bridge in place prior to the application of the tube and its Winding; Fig. 6 illustrates one hall of the bridge; Fig. 7 is a sectional view showing a modified device for holding the bridge sections together. a

Describing by reference characters the parts shown in these dra rings, 1 represents the mandrel, which. above described, is compris d preferably of sheet metal and is preferably (but act necessarily) substantially circular l 't' a plan and in, othe: words ot particular cross section torus shape. This menu el discontinuous at one point as how the ends be ing preferably ng each other;

'erful pressure upon the and to bridge over this gap and connect it we have provided a device consisting of a pair of similar sheet metal channels 3-3, each semi-circular inc-rose section at every point but curved a whole from end to end upon a radius equal to that of the mandrel itself. These channels are fastened together at their point of greatest diameter by suitable means such as the hinge l, Whose axis is tangent to the body at its largest point. Suitable means are provided for holding the halves together, such. means preferably consisting of one or more spiral springs 5 which traverse the body and are connected at their ends to the channel members, but other means such as the snap 6 shown in big. i can be employed. In Figs. 2-6 inclusive We have shown the inner ed es of the channel as formed with notches T tor the insertion of the fingers whereby the device may be opened and applied to or removed from the mandrel. The internal diameter of the bridge is preferably such as snugly to receive the adjacent mandrel ends as shown in Fig. 1 although no damage is done it the same be slightly undersized as it will then be clamped the more tightly. The length of the bridge is also such to slightly overlap the ends of the mandrel.

In use, after the bridge has been applied as described, the remainder of the mandrel is covered with a raw rubber gum mixed with the ,vulcanizing material, as shown at 10 in Fig. 1, and the same terminating just short of the bridge. The entire device, bridge and all, is then wrapped spirallyby strips of textile fabric as shown at 11, said fabric being preferably wet or moist when applied. This wrapping is generally done by machinery and is continuous over the bridge as well as over the rubber part, the thickness of the bridge beingsubstantially the same as that of the rubber, so that the complete and uniform wrapping-s can easily be cfiected by machinery. The niandrel' with its covering is then transferred 'to the curing oven where it is hung up, preferably by the bridge, so that the supporting device will have no injurious upon the rubber tube. The heat of 1 to dry the fabric and thereby p a powaud also are wherecures the rubber under that byan excellent cure is i As already pointed our improved lit) bridge be eiimieyed with cast iren 1118.11 d seie Liv .1 those 01? sheet metal, 3 mete} ziieiidreis are preferabie in lighter to handle and i0 i-L more saiisfizietory cure of the. rubber because 063 I smalls? heat capacity. it will be unde stood that many changes can be 1011i departing from our inventien. thus descr bed our invention, Whab We claim i 1 mandrel for pneumatic tirefeuhes ng curvilinear body having its waged epposii'e zmd in ziiineineiit i othei' and spaced apart, in combi- & heliow ursuate sheet metal grinder than the distance be :iid e21 and adapbed to receive the body being made of rebiiively ens whereby it can be applied body having its each other and ibinaixion with a hollow metal body 01 length gi'eziter ';":2110@ between said ends and seine, Said body enn- 3 channel lnOil'ibGTS longitudinal axis. 1' pneimmtic iii-e cubes curvilinear body having its ends; iiilli] ed fi'llbfeizlhtiztiiy opposite and e meed from a h other and spaced apart, in heiiew arcuaie sheet CC ibiiintmn mom] body of length greater than the distance betneen said endev and adapted t0 13ebe Ye the $211110, said body being split 101ig1- tndiimliy into sepiu-abie sections, and means metal bridge miapted to overlap and join together the'eiids of said iiizuidrel.

5. A bridge for tube nmnchels consisting ei an areuate heilew sheet meta-i1 b0 splitlongitudiiially into two SiiCiilOlls whih are hinged together upon an a s tangeiit be said body at its point of greatest radius.

A bridge for tube mundieis consisting of an arcuate sheet metal bedy split iongiindinziily into two parts zmd a ti-ieiisvei'se tension spying connecting said parts.

Y. A bridge for tube i'naildreis consisting of an :urcuaize sheet metal body split lengi mdiimiiy "150 two par hing-i means c0nmeeting said. Paris, and a tension spring attached to hold them together.

S. A bridge for tube mandible consisting of an aieimte hollow sheet mend body splitiong'itndinally into SGC/tiflDH. and 3110mm for hoiding said sec'rions dei-zwhnbiy together.

In testimony whereof, we hereunto affix omsignnhn'es.

DON A. CLARK. CLY E W WE ilk ea: 01 said parts and handing te' 

